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Finding the Fourth Proportional to 528.69, 789.95 and 389.27

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Solution

The fourth proportional to 528.69, 789.95 and 389.27 is: 581.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.69 : 789.95 = 389.27 : x
  2. Step 2: Convert to fraction form
    528.69/789.95 = 389.27/x
  3. Step 3: Cross multiply
    528.69x = 789.95 × 389.27
  4. Step 4: Simplify right side
    528.69x = 307,503.84
  5. Step 5: Solve for x
    x = 307,503.84/528.69
  6. Step 6: Final answer
    x = 581.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.